WoW is a very good game for what it does. Please take note that what I say is merely my opinon.
- It's very easy to pick up and get started in. Early quests will gradually lead you to new areas before leaving you on your own.
- No group? No worries. Most content is soloable up until the bigger instances and raids.
- All raids are instanced. No more worrying if another group gets to the area before you.
- Fantastic graphics.
- A wonderful set of lore really does make you interested in the world and events around you.
- Several playable races and classes, though classes are limited by race.
- If you don't like to raid or PvP, this game holds little for you beyond 60. All endgame content is geared towards raiders and PvPers.
- Very gear oriented. True, you must have skill to play your class. But at higher levels, your gear makes a thorough difference in PvP or raiding.
- It is a very streamlined, hand-holding experience. If you like more sandbox sorts of games, this isn't for you.
- Classes often get marginalized and become 'cookie cutter' do to what works best in the game. Your skill sets may not differ much from anyone else and indeed, in most instances, to have the best chance is to be cookie-cutter.
- There are three main roles: The Tank, The Healer, the DPS. Often classes, such as Shaman/Druids get lumped into the healing because the DPS power of the Rogue/Warlock/Mage/Hunter is superior. Tanks are pretty much limited to the warrior class and often this is all they are effective for.